The U.S. Army Corps of Engineers wants people to not be alarmed when they see a helicopter flying and spraying along the Missouri River this month.

First, make sure you've installed an appropriate version of R, 3.5 or later. If you need to install offline, follow the offline installation instructions. If everything worked, you should be ready to ...

As a condition of using these data, you must cite the use of this data set. Such a practice gives credit to data set producers and advances principles of transparency and reproducibility. Other ...